代谢
关于氟氢可的松在体内的具体代谢途径信息非常有限。氟氢可的松的9α-氟化似乎极大地简化了其代谢过程,与其他皮质类固醇相比——虽然已经观察到通过11-羟基类固醇脱氢酶的氧化反应,但这种反应受到很大程度的阻碍,因为氟原子基团似乎赋予了对抗这些酶的11β-氧化的“保护”。11β-氧化减少被认为是氟氢可的松具有显著盐皮质激素效力背后的原因之一。在体外研究中,仅在人类肝微粒体和细胞质中孵化后产生了两种代谢物,分别为20β-二氢氟氢可的松和6β-羟基氟氢可的松,并且没有详细探索可能负责这种反应的潜在酶。鉴于氟氢可的松是一种皮质类固醇,这类药物已知由CYP3A家族代谢,并且不建议与强效的CYP3A抑制剂/诱导剂联合使用,CYP3A家族的酶可能在某种程度上参与了其代谢(尽管这一信息似乎并没有特别针对氟氢可的松进行阐明)。
There exists is a paucity of information regarding the specific metabolic pathway _in vivo_ of fludrocortisone. The 9α-fluorination of fludrocortisone appears to greatly simplify its metabolism as compared to other corticosteroids - while oxidation via 11-hydroxysteroid dehydrogenases has been observed, this reaction is greatly impaired as the fluorine moiety appears to confer "protection" from 11β-oxidation by these enzymes. The reduction in 11β-oxidation is thought to be one of the reasons behind fludrocortisone's profound mineralocorticoid potency. An _in vitro_ study generated only two metabolites following incubation in human liver microsomes and cytosol, namely 20β-dihydrofluorocortisol and 6β-hydroxyfluorocortisol, and did not explore in detail the potential enzymes responsible for this reaction. Given that fludrocortisone is a corticosteroid, a class of medications known to be metabolized by the CYP3A family, and is not recommended to be given with strong inhibitors/inducers of CYP3A, it is likely that the CYP3A family of enzymes contributes in some way to its metabolism (though this information does not appear to have been specifically elucidated for fludrocortisone).
来源:DrugBank